Abstract
The hierarchy among the radiative γ(π0,η,η′) decay channels for the ψ′ looks quite different from the J/ψ one. The fate of charm, namely an ultimate survival of on-shell cc¯ intermediate states, might give us the clue for this new puzzle in exclusive charmonium decays. A similar self-preservation has already been invoked in the past to solve the so-called ρπ puzzle.
Highlights
Puzzling electromagnetic and strong anomalous two-body decays have been a source of successful inspiration in the past
The observation of non-vanishing π0 → γγ and suppressed Φ → ρπ processes played a crucial role in our setting up of Quantum Chromodynamics (QCD)
In this Letter, we consider the possibility that such a striking difference between the dynamics of the fundamental ccvector bound state and its first radial excitation is a direct consequence of the available phase space left for a ccmeson to eventually survive ψ′ anomalous decays
Summary
Puzzling electromagnetic and strong anomalous two-body decays have been a source of successful inspiration in the past. Recent results on anomalous charmonium decays into light pseudoscalars [1] suggest a new puzzle.
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